Effect of polycarboxylate superplasticizer and temperature on the rheological properties of seawater-mixed ferric-rich sulfoaluminate cement-based composite slurries

•PCE reduces viscosity and improves shear-thinning behavior of seawater-mixed FR-SCC slurries.•The Power Law model effectively characterizes the rheology of FR-SCC slurry.•The effect mechanisms of PCE and temperature on FR-SCC slurries are revealed.•A rheological model for FR-SCC slurries at various temperatures is established. In this study, the effects of polycarboxylate superplasticizer (PCE) and temperature on the rheological properties of seawater-mixed ferric-rich sulfoaluminate cement-based composite (FR-SCC) slurries were investigated. The results show that the viscosity of seawater-mixed FR-SCC slurries initially decreases and then stabilizes as PCE content increases. Moreover, PCE improves the shear-thinning behavior and the stability of the slurry. As temperature increases, the shear stress and rheological index of the slurry increase, while the consistency coefficient decreases. Furthermore, a constitutive equation is established to describe the rheological behavior of seawater-mixed FR-SCC slurries at different temperatures.